CN112087136B - Shut-down control circuit and control method thereof - Google Patents
Shut-down control circuit and control method thereof Download PDFInfo
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- CN112087136B CN112087136B CN202010778074.3A CN202010778074A CN112087136B CN 112087136 B CN112087136 B CN 112087136B CN 202010778074 A CN202010778074 A CN 202010778074A CN 112087136 B CN112087136 B CN 112087136B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 47
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a turn-off control circuit and a control method thereof, wherein the circuit comprises a non-isolated DC/DC circuit (101), a delay adjusting circuit (102) and a control circuit (103), the non-isolated DC/DC circuit (101) comprises a non-isolated DC/DC module power supply which can be any one or a combination of a plurality of buck-boost circuits; the delay adjusting circuit (102) comprises a capacitor C1, a resistor R1 and a rheostat RP1, wherein the rheostat RP1 is a variable resistor; the control circuit (103) includes an inductance L1, a diode D2, a switching tube Q1, and a switching tube Q2. The invention can realize the quick turn-off of the contactor and can also improve the PF value; under the condition of high and low pressure, the turn-off speed can be more stable; in addition, compared with the prior art, the circuit input voltage range can be wider under the condition of realizing similar turn-off speed, the cost is reduced, and the temperature rise is reduced.
Description
Technical Field
The invention relates to the field of contactors, in particular to a turn-off circuit and a control method thereof.
Background
At present, a large number of contactor power saving circuits appear in the contactor industry, but the following problems generally exist:
1. fig. 1 is a schematic diagram of a common power-saving circuit, in which, in order to make a contactor turn off rapidly, a coil current needs to be consumed rapidly, but when the contactor is turned off, coil energy can only be consumed through a freewheeling diode, and a voltage drop of the freewheeling diode is small, so that the coil energy consumption is slow, and the contactor is turned off very slowly. In the traditional contactor product, the turn-off time is about 50ms, and the turn-off time of the contactor product added with the power saving circuit can be increased to about 200ms, namely, the turn-off time is about four times of the original turn-off time. In some applications, the increase of the turn-off time can cause fatal problems, such as the increase of the arc-striking time between the main contacts of the contactor after the turn-off speed of the contactor for controlling the forward and reverse rotation of the motor is reduced, and then the serious threat to the service life of the contactor is caused.
2. The circuit schematic diagram of the contactor coil control circuit disclosed in the patent publication No. CN106024521B is shown in fig. 2, and in the quick turn-off stage, the main power switch tube TR1 is turned off, and the coil current is quickly consumed by the diode D1 and the quick turn-off circuit (namely the switch tube TR 2), so that the quick turn-off effect is achieved. The circuit has the defects that in the turn-off stage, a switching device of the quick turn-off circuit works in an amplifying region, more energy is lost when a contactor coil freewheels, on one hand, the turn-off time of the contactor is longer due to lower demagnetizing voltage of the contactor coil, the loss of the power saving circuit in the turn-off stage is increased, and on the other hand, the temperature of the switching device of the quick turn-off circuit is increased and the reliability is reduced. Meanwhile, in the scheme, in the turn-off process, almost all energy in the coil is consumed on the switching tube TR2, and in the occasion of frequent turn-on and turn-off, the switching tube TR2 can be damaged due to excessive heating, and the energy waste is serious.
3. The circuit schematic diagram of the patent with publication number CN201911066386.5 is shown in figure 3, when the contactor is turned off, the coil energy is fed back to the input end, and the coil current is rapidly reduced by using the input voltage, so that the effect of rapid turn-off is achieved. But this circuit has several drawbacks: ① When the input voltage is lower, the quick turn-off effect is not good, and the quick turn-off cannot be realized; ② When the input voltage fluctuates, the turn-off delay also fluctuates greatly; ③ When the capacitance of the input capacitor is smaller, the input voltage ripple is large, and the turn-off delay is greatly different; ④ When the input voltage is higher, a larger MOS tube is needed, and the cost is high.
Disclosure of Invention
Based on the summary, the technical problem to be solved by the invention is to provide a turn-off control circuit and a control method thereof, which can accelerate the turn-off speed of a contactor, ensure that the turn-off delay is not different under different input voltage ranges, and keep the turn-off speed stable; meanwhile, when the input voltage is lower, the function of ultra-fast turn-off can be realized; when the same input voltage is applied, the turn-off delay adjustable function can be realized. In addition, the invention can be also applied to the electromagnetic valve device according to the requirement of the electromagnetic valve on the turn-off control and the similarity between the working principle and the contactor.
Based on the above purpose, the technical scheme of the turn-off control circuit and the control method thereof of the invention is as follows:
A shut down control method for a contactor, comprising the steps of:
the control circuit is used for converting different input voltages into a stable output voltage through the non-isolated DC/DC circuit and providing the stable output voltage to the contactor;
The end voltage of the capacitor C1 is regulated through an adjustable resistor of the delay regulating circuit, the capacitor C1 is connected in parallel between the output ends of the non-isolated DC/DC circuit, and when the end voltage of the capacitor C1 obtained through the regulation of the adjustable resistor is larger, the coil current of the contactor drops faster, namely the contactor is turned off faster; when the terminal voltage of the capacitor C1 obtained by the adjustable resistance adjustment is smaller, the coil current of the contactor is reduced more slowly, i.e. the contactor is turned off more slowly.
As a specific implementation mode of the method, a turn-off control circuit is used for a contactor and comprises a non-isolated DC/DC circuit (101), a delay adjusting circuit (102) and a control circuit (103) which are sequentially connected in parallel;
The non-isolated DC/DC circuit (101) comprises a non-isolated DC/DC module power supply, wherein the input end of the non-isolated DC/DC circuit (101) is used for being connected with the positive electrode of a rectifier BD1 in electromagnetic control equipment, and the output negative end of the non-isolated DC/DC circuit (101) is used for being grounded;
The delay adjusting circuit (102) comprises a capacitor C1, a resistor R1 and a rheostat RP1, one end of the capacitor C1 and one end of the resistor R1 are connected with the positive output end of the non-isolated DC/DC circuit (101), the other end of the resistor R1 is connected with one end of the rheostat RP1, and the other end of the rheostat RP1, a movable contact point of the rheostat RP1 and the other end of the capacitor C1 are grounded;
The control circuit (103) comprises an inductor L1, a diode D2, a switching tube Q1 and a switching tube Q2, one end of a capacitor C1 is further connected to the intersection point of the cathode of the diode D1 and the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is connected with one end of the inductor L1, the other end of the inductor L1 is connected to the intersection point of the drain electrode of the switching tube Q2 and the anode of the diode D1, the anode of the diode D2 is connected with the other end of the capacitor C1, the cathode of the diode D2 is connected to the source electrode of the switching tube Q1, and the anode of the diode D2 and the source electrode of the switching tube Q2 are used for grounding.
Preferably, the non-isolated DC/DC module power supply is a BOOST circuit, and comprises an inductor L2, a capacitor C2, a diode D3, a switch tube Q3 and a resistor R2, wherein one end of the inductor L2 is an input end of the non-isolated DC/DC circuit (101), one end of the inductor L2 is also connected with one end of the capacitor C2, the other end of the inductor L2 is connected to an intersection point of an anode of the diode D3 and a drain electrode of the switch tube Q3, a source electrode of the switch tube Q3 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the other end of the capacitor C2, the connection point is an output negative end of the non-isolated DC/DC circuit (101), and a cathode of the diode D3 is an output positive end of the non-isolated DC/DC circuit (101).
Preferably, the non-isolated DC/DC module power supply is a BUCK BUCK circuit, and comprises a switching tube Q3, an inductor L2, a capacitor C2, a diode D3 and a resistor R2, wherein the drain electrode of the switching tube Q3 is an input end of the non-isolated DC/DC circuit (101), the drain electrode of the switching tube Q3 is also connected with one end of the capacitor C2, the source electrode of the switching tube Q3 is connected to an intersection point of one end of the inductor L2 and an anode of the diode D3, the other end of the inductor L2 is connected to one end of the resistor R2, the other end of the resistor R2 is connected with the other end of the capacitor C2, the connection point is an output negative end of the non-isolated DC/DC circuit (101), and the cathode of the diode D3 is an output positive end of the non-isolated DC/DC circuit (101).
Preferably, the control circuit (103) further comprises a resistor R3, and the source of the switching tube Q2 is grounded through the resistor R3.
Compared with the prior art, the invention has the following beneficial effects:
1. The voltage of the capacitor C1 is designed by adjusting the resistance value of the resistor RP1, the turn-off speed is flexibly adjusted, and the turn-off time adjustable function is realized;
2. Through the non-isolated DC/DC circuit 101, when the voltage at two ends of the capacitor C1 is boosted to a larger value, ultra-fast turn-off can be realized;
3. The invention can realize quick turn-off even when the input voltage is lower, and the turn-off speed can still be kept at a quick level under the condition that the input voltage fluctuates, and the turn-off speed is stable;
4. When the input voltage is higher, the input voltage is reduced to a proper value through the non-isolated DC/DC circuit 101, so that the stress of a later-stage switching tube can be reduced while the quick turn-off is ensured, the cost is reduced, and meanwhile, the temperature rise is also reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art contactor power saving circuit without a quick turn-off function;
FIG. 2 is a schematic diagram of a prior art contactor power saving circuit with a quick turn-off function;
FIG. 3 is a schematic diagram of a prior art contactor power saving circuit with a quick turn-off function;
FIG. 4 is a schematic diagram of a control application of the shut down control circuit of the present invention;
FIG. 5 is a schematic diagram of a circuit application of a second embodiment of the present invention;
fig. 6 is a schematic diagram of a third embodiment of the present invention.
Detailed Description
The circuit of the present invention will be described below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the circuitry of the present invention.
First embodiment
As shown in fig. 4, a schematic diagram of the control application of the shutdown control circuit of the present invention is shown, the control circuit is applied to a contactor, and the L/N line of the power grid of the contactor is connected in series to the rectifier BD1 through the non-polar two ends of the rectifier BD1.
The control circuit of the embodiment comprises a non-isolated DC/DC circuit 101, a delay adjusting circuit 102 and a control circuit 103 which are sequentially connected in parallel;
The non-isolated DC/DC circuit 101 comprises a non-isolated DC/DC module power supply, wherein the input end of the non-isolated DC/DC module power supply is connected with the positive electrode of the rectifier BD1, and the output negative end of the non-isolated DC/DC module power supply is grounded;
the delay adjusting circuit 102 comprises a capacitor C1, a resistor R1 and a rheostat RP1, wherein one end of the capacitor C1 and one end of the resistor R1 are connected with the positive output end of a non-isolated DC/DC module power supply, the other end of the resistor R1 is connected with the 3 end of the rheostat RP1, and the 1 end of the rheostat RP1, a movable contact point 2 of the rheostat RP1 and the other end of the capacitor C1 are grounded;
the control circuit 103 includes an inductor L1, a diode D2, a switching tube Q1 and a switching tube Q2, one end of a capacitor C1 is further connected to an intersection point of a cathode of the diode D1 and a drain electrode of the switching tube Q1, a source electrode of the switching tube Q1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to an intersection point of a drain electrode of the switching tube Q2 and an anode of the diode D1, an anode of the diode D2 is connected to the other end of the capacitor C1, a cathode of the diode D2 is connected to a source electrode of the switching tube Q1, and an anode of the diode D2 is grounded to a source electrode of the switching tube Q2.
The working principle of the first embodiment of the invention is as follows:
The input voltage is rectified by the rectifier BD1 and then acted by the non-isolated DC/DC circuit 101, the input voltage is designed to be a stable value at a certain voltage point, when the contactor is turned off, the switch Q1 and the switch tube Q2 are turned off, the coil current sequentially passes through the inductor L1, the diode D1, the capacitor C1 and the diode D2 to carry out follow current, the falling speed of the coil current is determined by voltages at two ends of the capacitor C1, and when the voltages at two ends of the capacitor C1 are larger, the coil current is reduced faster, and the contactor is turned off faster.
The voltage of the connection point PL of the resistor R1 and the 3 end of the rheostat RP1 is collected, the resistance value of the adjustable resistor RP1 is changed according to the collected voltage, the voltage of the two ends of the capacitor C1 is increased or reduced, the turn-off speed can be flexibly adjusted, the turn-off speed adjustable function is realized, and meanwhile, the PF value of a product can be improved.
Second embodiment
As shown in fig. 4, a schematic diagram of a circuit application of a second embodiment of the present invention is shown, and compared with the first embodiment, the difference is that the circuit of the second embodiment of the present invention further includes a resistor R3, the non-isolated DC/DC module power supply in the circuit is a BOOST circuit, the BOOST circuit includes an inductor L2, a capacitor C2, a diode D3, a switch tube Q3, and a resistor R2, one end of the inductor L2 is an input end of the non-isolated DC/DC circuit 101, one end of the inductor L2 is further connected to one end of the capacitor C2, the other end of the inductor L2 is connected to an intersection point of an anode of the diode D3 and a drain electrode of the switch tube Q3, a source electrode of the switch tube Q3 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the other end of the capacitor C2, the connection point is an output negative end of the non-isolated DC/DC circuit 101, and a cathode of the diode D3 is an output positive end of the non-isolated DC/DC circuit 101.
The resistor R3 is a sampling resistor and is a ring for realizing constant current of the contactor.
The working principle of the second embodiment of the present invention is the same as that of the first embodiment, and will not be described here.
Third embodiment
As shown in fig. 6, which is a schematic diagram of a circuit application of a third embodiment of the present invention, compared with the second embodiment, the non-isolated DC/DC module power supply in the circuit of the third embodiment of the present invention is a BUCK circuit, and the components of the BUCK circuit are the same as those of the BOOST circuit of the second embodiment, except that one end of the inductor L2 is an input positive end of the non-isolated DC/DC circuit 101, one end of the inductor L2 is further connected to one end of the capacitor C2, the other end of the inductor L2 is connected to an intersection point of the anode of the diode D3 and the drain of the switching tube Q3, and the source of the switching tube Q3 is connected to one end of the resistor R2.
The third embodiment of the present invention has the same operation principle, except that when the input voltage is high, the input voltage can be reduced to a proper value by the BUCK circuit in the non-isolated DC/DC circuit 101, so that the stress of the post-stage switching tube is reduced while the quick turn-off is ensured, the cost is reduced, and the temperature rise is reduced.
The invention is also applicable to solenoid valves, the connection and operation principle of which are substantially the same as those of contactors, and will not be described here. The above is only a preferred embodiment of the present invention, and alterations and modifications may be made to the above-described specific embodiment by those skilled in the art to which the present invention pertains. Therefore, the invention is not limited to the specific control modes disclosed and described above, and some modifications and changes of the invention should fall within the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (5)
1. A shut down control circuit for a contactor, characterized by: the device comprises a non-isolated DC/DC circuit (101), a delay adjusting circuit (102) and a control circuit (103) which are sequentially connected in parallel;
the non-isolated DC/DC circuit (101) comprises a non-isolated DC/DC module power supply, wherein the input end of the non-isolated DC/DC circuit (101) is used for being connected with the positive electrode of a rectifier BD1 in electromagnetic control equipment, and the output negative end of the non-isolated DC/DC circuit (101) is used for being grounded;
The delay adjusting circuit (102) comprises a capacitor C1, a resistor R1 and a rheostat RP1, one end of the capacitor C1 and one end of the resistor R1 are connected with the positive output end of the non-isolated DC/DC circuit (101), the other end of the resistor R1 is connected with one end of the rheostat RP1, and the other end of the rheostat RP1, a movable contact point of the rheostat RP1 and the other end of the capacitor C1 are grounded;
The control circuit (103) comprises an inductor L1, a diode D2, a switching tube Q1 and a switching tube Q2, one end of a capacitor C1 is further connected to the intersection point of the cathode of the diode D1 and the drain electrode of the switching tube Q1, the source electrode of the switching tube Q1 is connected with one end of the inductor L1, the other end of the inductor L1 is connected to the intersection point of the drain electrode of the switching tube Q2 and the anode of the diode D1, the anode of the diode D2 is connected with the other end of the capacitor C1, the cathode of the diode D2 is connected to the source electrode of the switching tube Q1, and the anode of the diode D2 and the source electrode of the switching tube Q2 are used for grounding.
2. The shutdown control circuit of claim 1 wherein: the non-isolated DC/DC module power supply is a BOOST circuit and comprises an inductor L2, a capacitor C2, a diode D3, a switching tube Q3 and a resistor R2, wherein one end of the inductor L2 is an input end of the non-isolated DC/DC circuit (101), one end of the inductor L2 is also connected with one end of the capacitor C2, the other end of the inductor L2 is connected to an intersection point of an anode of the diode D3 and a drain electrode of the switching tube Q3, a source electrode of the switching tube Q3 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the other end of the capacitor C2, the connection point is an output negative end of the non-isolated DC/DC circuit (101), and a cathode of the diode D3 is an output positive end of the non-isolated DC/DC circuit (101).
3. The shutdown control circuit of claim 1 wherein: the non-isolated DC/DC module power supply is a BUCK BUCK circuit and comprises a switch tube Q3, an inductor L2, a capacitor C2, a diode D3 and a resistor R2, wherein the drain electrode of the switch tube Q3 is the input end of the non-isolated DC/DC circuit (101), the drain electrode of the switch tube Q3 is also connected with one end of the capacitor C2, the source electrode of the switch tube Q3 is connected to the intersection point of one end of the inductor L2 and the anode of the diode D3, the other end of the inductor L2 is connected to one end of the resistor R2, the other end of the resistor R2 is connected with the other end of the capacitor C2, the connection point is the output negative end of the non-isolated DC/DC circuit (101), and the cathode of the diode D3 is the output positive end of the non-isolated DC/DC circuit (101).
4. A shutdown control circuit according to any one of claims 1 to 3, wherein: the control circuit (103) further comprises a resistor R3, and the source electrode of the switching tube Q2 is grounded through the resistor R3.
5. A shutdown control method for the shutdown control circuit of any of claims 1 to 4, adapted to a contactor, comprising the steps of:
the control circuit is used for converting different input voltages into a stable output voltage through the non-isolated DC/DC circuit and providing the stable output voltage to the contactor;
The end voltage of the capacitor C1 is regulated through an adjustable resistor of the delay regulating circuit, the capacitor C1 is connected in parallel between the output ends of the non-isolated DC/DC circuit, and when the end voltage of the capacitor C1 obtained through the regulation of the adjustable resistor is larger, the coil current of the contactor drops faster, namely the contactor is turned off faster; when the terminal voltage of the capacitor C1 obtained by the adjustable resistance adjustment is smaller, the coil current of the contactor is reduced more slowly, i.e. the contactor is turned off more slowly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010778074.3A CN112087136B (en) | 2020-08-05 | 2020-08-05 | Shut-down control circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010778074.3A CN112087136B (en) | 2020-08-05 | 2020-08-05 | Shut-down control circuit and control method thereof |
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| CN112087136B true CN112087136B (en) | 2024-07-19 |
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| CN212660110U (en) * | 2020-08-05 | 2021-03-05 | 广州金升阳科技有限公司 | Shutoff control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106024521B (en) * | 2016-07-05 | 2019-02-05 | 广州金升阳科技有限公司 | A kind of contactor coil control circuit |
| CN108735552B (en) * | 2018-08-17 | 2024-01-16 | 广州金升阳科技有限公司 | Coil control circuit of contactor |
| CN110828236A (en) * | 2019-11-04 | 2020-02-21 | 广州金升阳科技有限公司 | Contactor power-saving control circuit and control method thereof |
| CN110867343B (en) * | 2019-11-20 | 2021-10-22 | 广州金升阳科技有限公司 | Contactor coil isolation control circuit and isolation control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212660110U (en) * | 2020-08-05 | 2021-03-05 | 广州金升阳科技有限公司 | Shutoff control circuit |
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